callisthenics
Concise Oxford English Dictionary © 2008 Oxford University Press:
callisthenics /ˌkalɪsˈθɛnɪks/ (US calisthenics)
▶plural noun gymnastic exercises to achieve bodily fitness and grace of movement.
– derivatives
callisthenic adjective.
callisthenic adjective.
'callisthenics' also found in these Oxford entries:

